Osnabrück 2002 – wissenschaftliches Programm

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MS: Massenspektrometrie

MS 2: Beschleunigermassenspektrometrie

MS 2.6: Vortrag

Mittwoch, 6. März 2002, 17:45–18:00, HS 02/E04

The origin of ³⁶Cl in modern precipitation — •Vitali Lazarev¹, A. Blinov², Th. Huber¹, F. Kubo¹, H. Reithmeier¹, and E. Nolte¹ — ¹Technische Universität München — ²St. Petersburg Technical University, Russia

The measurements of ³⁶Cl in modern precipitation have shown significantly higher fluxes than those calculated from cosmic ray induced atmospheric production. The discrepancy can be explained by reemitting of the fallen down bomb ³⁶Cl back into the troposphere. The biosphere taking up chlorine and releasing it in form of CH₃Cl after decay is discussed to be a suitable storage box.

In order to get more information about distribution of ³⁶Cl fluxes the AMS measurements of water from lakes with long flushing times were performed. ³⁶Cl of different origins like natural production, Chernobyl accident, and bomb tests can be distinguished with the help of theoretical modeling. Also the experiment to collect CH₃Cl from the air and to measure ³⁶Cl/Cl is presented. The obtained ratio indicates that the recycling is likely to be the reason of high observed ³⁶Cl fluxes.